Sound emitting device



July 5, 1932 H. K: BOUVIER ET AL 1,856,188Y

SOUND EMITTING DEVICE l Filed June' 15, 1929 s sheets-sheet 1 July 5 A18932 H. K. 'BOUVIER ETAL 1,855,188

soUND EMITTING DEVICE Filed June 15, 1929 s sheets-sheet 2 oie .50 46 lilly 5, 1932- H. K. BOUVIER ET Al.- 1,866,188.

SOUND EMITTING DEVICE l Filed June 15, 1929 I5 Sheets-Sheet 3 M42/@ fw@ 13g gm @M Patented July 5, 1932 t :i

HAROLD `KAELEOUVIEE-Am) EEEELANQD-"WELLsor LA GRANGE,` ILLINOIS, AssIeNoEs `"ro TEMPLE com?oEA'rIoN, or cHIcAGdILLINoIs, A ooEroRA'rroN 'or DELAWARE V4, is made, and 1 t Y, e Fig. Gis a perspective view of one of a plus.v

sou-ED Eiz'rrrrrNG .DEVICE ppliation yfiled jJ' une 15,

Our invention relates toa-loud2 speakersof thetype adapted toA be enfiployed` in connecttion with radio-receiving sets', sound amj plifying apparatus, and theflike, has

among its other objectsthe :productionof' devices of vthe kind describedthat' are compact, durable, simple in construction and efficient. A particular object ofthe invention is to provide a device ,ofv the kind described` that will reproduce Asound withoute. distortion thereof. I i Anotherparticular objectr of the invention is to provide -an improved'loudspeaker com#y p'risingI parts which may be quickly and easily assembled with eachother. f f Y Y Still another particularobject-offthe vention'is to provide an improved magnetlzspeakers employing'.V

ing' structure for loud such structures.Y Y. l 7;, `M anyothe'r objects and advantages will become apparentv as thisk description', prol-V gress'es, reference being had to thefacc'ompanying drawings, wherein: i 'A Figure 1 is a central,verticalsectiontaken through a loudspeakerembodying the invention. f .i f

Fig. 2 is a section taken Online l2'-,2 *ofv Figf a is a section taken 'oniineea of Fig. 2. e f

Fig. 4L vis a perspective viewfof a the improved magnetizing ystructure ofthe loud speaker shown inFigil. J i Y Figs is a Side elevation qftheblak freiliwhich one of the laminations, shown in Fig.

rality of bars whichiare, preferably-employed in the improved magnetizingstructure.

Referring to the drawingswherein ywe have shown a preferredform ofthe invention-.embodied in a loud speaker, the reference char'- Yacter 10 designates generallyk an improved Ilvlagnetizingk structurel having an,r annular Ymagnetic kfield llin which a KA'winding l2 is movablyV mounted, the winding l.12 V.being 'op'v` eratively connectedbya sleeve 1&3 toga diaphraginll,` the diaphragm Y1 4 preferably comprising a fcom'cal.A portion.. 15 [preferably formed from paper or any other suitablema 1929. Seiaino. 371,237..

terialfthe base or larger `end of the conical" portionl beingsecured toan annular ring 17 which is preferably formedfromrelaltiveporting member 18 and a Lring 19,the ring' 119r being-secured tothe supporting member`f18 bybelts` 20,017 the equivalent.v f'Thefsupport i ing member 18 preferably comprises anlaper'- tured frusto-conical portion 22fand1an-integral disc portion 23 lprovided with a plurality ofapertures through which' a yplural"- ity of bolts 25 project. l

H- As bestshownin'Fig. 4, our improved magnetizi'ng structure lO'preferably comprises a pluralityfof laminations 26, 26a, 27a and 27. Thesev laminations are preferably Lv-shaped so thatk eachlamination comprises two por.- f

tions extending at right anglestoeach'otherf Qneportion of each of theflaminations -ex;-

tends i rearwardly, Y as' illustrated inl Figs. 12 and 4, these rearwardlyextending portions being secured to each other by rivets 28, orthe l l' equivalent; The rearwardly extending portions of the 1ami`nation`s'26, 26a,` 27a 'and '27k provide E-shaped portionsl of which'the cen'- tralarm forms a pole piece 29 which is pret-y Y ferablyf ofrectangular cross-section. uThe rsa otherfportions of the laminations extend' out'-r wardlyrandat right anglesto the E-shaped portions andarearranged tosurround the pole piece129. fThis construction.. is accom.

'plishedl byi providing substantially U -shaped 1' i slots 32 in the llaminations, as best Villustrated Vin Figg, wherein' the blank .for the laminationg26 is shown. g The. dotted lines SSinFg,

5 indicatetheflinepalongfwhich thewbla-nk is bent so that the lamination willcom'pfrisetWo portionsfextending at right angle'sfte each Disposed around theppolepiece-29` A fera'blyengaging4 Athe corners thereofis lsleevefu of Vmagnetic materiakfand inserted i.

betweenithe pole piece 29 andthe sleeve are ,a plurality Of Ibas', also formed. ,Of :inagneticl'matlalyy The frontend Y37 of lthe V. Asleevef'fis preferably of reduced diameter',

andis alined: with a polefpiece 38 which has an ou aperture 39 v disposed 'concentri'cally with "re- 1Vspect to the sleeve 35. It will be noted that the annular magnetic field 1l is formed between the pole piece 38 and the forward end 37 of the sleeve 35.

, Disposed around the sleeve 35 and carried Vthereby is a sleeve formed of a non-mag netic materialand disposed around't-hesleeve 40 is awinding 42 connected to any suitable source of electrical energy so that the annular magnetic ieldglZl will be relatively intense,

The SleerefiO funCtQnS as a Short Cr-Cuited:

secondary winding with respect to the winding 42 and eliminates some of therl'ii-gh tre-` quency currents which otherwise would ca use a hum in the loud speaker.- Y f It will be noted that the bolts 2,5y project ,throughapertures44 provided inthe lamina--V tijojnsr2`6, 26a, 27a and2-7 and that they project through apertures 45 andY 45`provided'V in a frameA member i 47, thei apertures 46 ibeing formed in yinwardly 4extending Vintegral flanges 49fformed1upj0n the frame member 47. The inwardly extendingk flanges 49 alreprlefefrably positioned' between the, pole piece 38 'and' th disc portion 2810i the diaphragm suppertineinmberiis.; Y `j Preferably Vcarried:by the bolts 25 is a. supe APlfllg Ymember 50 Ywhichjis preferably stamped' from relatively thin flexible sheet metal, the sheetmetal being alsorelativelyf resilient. Asindicatedin Figs. 2"and 3, the

member 50 is preferably rectangular-in shape,

and*v preferably comprises` a 'ilange V52cm te'fndifig aroundfits entire periphery. The

member 50 is vpreferably provided with a plurality of slots 53 which form Varms 54 that are formed'integral with a collar `secured tothe sleeve. 13. Nuts 58upon the bolts 25 space the membereO from the discportion 2.3 and the Vmember 454(),isY clamped between; the nuts. 58 and"nutsjOwhichfare also screw threaded upon thebolts.` i

e Y' The operation of the above describeddevice Y substantiallyfas Vfollows :The windingY 421s connected to any suitable'source ofelectrical energyfso thatarelatively intense annular field will obtainbetween the yp ole piece 38; and the sleeve 35. The winding 11 isconnectedto as'ourceoftelephonic current, ortheflike, and

this currentreacts with the magneticriield in suchmanner that the wind-ingll and the sleeve 1;3V vibrate vandimpart these vibrations l' to the diaphragm 14.y which translatethem in'- While YVwe tain embodiments of our invention, it iste be u'nglerstoodvv thatcrit is' capable of many'modil ons. Changes, therefore, ink the conf Astruction and arrangement may beV made i without departing from the spirit and scope oftheinaention as disclosedfin the appended claims, inr which itis ourintentionft'o claim ally novelty yfil'iherent in our invention as A broadly as possible, infviewof tl'lepruopr art.

A What we claim as new is: 1. A devlce of the kind described comprismg a magnet member formed from a plurality of L-shaped laminations having U- shaped slots cut therein to form a pole piece, a second pole piece having an aperture alined with-.the irst-mentionedpole piece-'to provide a magnetic field between the pole pieces, a diaphragm, and means reacting with said field foraetuetng said.. diaphragm...

' 2- A. devi@ Oi described @emprisinga magnet member formed of a plurality foJ--laminations bent to form L-shaped pieces,

crpsS-Seeten; @tube @magnetic material diS- posed'` laroungiljI saidi pole piece,l av second pole piece disposed around;` said` tube tol providea `Ilflagnetic field'between itself andsaid'tllbe, a; dephifagmaedreeans lreacting with Said ield'^for-'actuating saiddiaphragml d I 5,. A device of the kind described compris- `inga''mag'gnet'Ymember having a laminated pole piece yof substantially rectangular crosssecti'on, a tubeofsubstantially circularcross.-

. as 4.. A, device 0f. theklnld described] Compris'- nations, Seidllamnationsharnfr Substantial- 'ly' Ulshaped slots formed tliereinjtowprovide a pole piece 0fVV substantially rectangular sectiona/nd formed oli magneticrmaterialidis-V posed aroundf said ,polepiece, 'a seconde. pole piece (3o-operatingwithsaidtube to provide an annular, magnetic ijeldibetween itself` and said' tube, Va*diaphragm, .andL means reacting with saidifield for actuating'said diaphragm.

6. A device of the kind describedcompris- A 1n a magnet' memberhaving f a y laminated P0 section,- 'a- ,tubejo substantially circular crosse piece of* substantially'rectangular crosslsection and formed: of magneti cgm ateri al 'disl posed:LY around said" pole 'pie'ce, bars offmag netic Vmaterial insertedL between-' said pole` pieceand saidtu'beg," azfsecond poleer piece coopeiiatingr'with' said tube. togprovidejan an-` nulariiiagneefeaibewe. een: anden tube, vav diaxphre-gm,A anolj,A means reacting* ,with

said field for?actuatingsaiddiaphragm;

jf 71g ma deviceoftheliindedeseribedamagg net; member 'CQmP'nShee plurality. Orff? are? iso tured laminations forming a pole piece,each lamination being bent to have two portions disposed normal to each other, like portions of the laminations being all secured to each. other andthe other like portion thereof being disposed extending outward in opposed relation and surrounding said pole piece, a second pole piece surrounding the first-mentioned pole piece to provide an annular magnetic field, a diaphragm, and means reacting with said field for actuating said diaphragm.

8. In a device of the kind described, a magnet member comprising a pluralityof apertured laminations forming a `pole piece, each lamination being bent to have two portions disposed normal to each other,like portions of the laminations being all secured to each other and the other like portions thereof being disposed extending outward in opposed relation and surrounding said pole piece, a sleeve of magnetic material surroundingsaid pole piece and carried thereby, a second pole piece surrounding said sleeve to provide an annular magnetic field 'between itself and said sleeve, a diaphragm, and means reacting with said field for actuating saiddiaphragm.

'9. In a device of the kind described, a magnet member comprisinga plurality of aper tured laminations forming a pole piece of substantially rectangular cross-section, each lamination being bent to have two portions disposed normal to each other, like portions of the laminations being all vsecured to each other and the other like portions thereof being disposed extendingoutward in opposed relation and surrounding said pole piece, a sleeve of magnetic material disposed around said pole piece, bars of magnetic material in-Y serted between said sleeve and said pole piece,

a second pole piece surrounding the sleeve to provide an annular magnetic field between itself and said sleeve, a diaphragm, ,and means reacting with said field for actuating said diaphragm. Y

10. In a device of the kind described, a!

magnet member comprising va plurality of apertured laminations forming a pole piece, each lamination beingbent to have two portions disposed normal to each other, like portions of the laminations being all secured `to each other and the other like portions thereof being disposed extending outward in Y opposed relation and surrounding said pole piece, a sleeve df magnetic material disposed around said pole piece, a winding around vat the freeend Yof said pole piece extending outwardly at right angles to said E-shaped portion, of asecond pole piece secnredto said parts of said laminations and VVdisposed around the first-mentioned pole piece to provide amagnetic {ield between the pole pieces,

a diaphragm, and means reacting with said Vfield for actuating said diaphragm.

12. In a device Vof the kind described, the combination withl a magnet member formed of laminations and comprising an E-shaped portion of which the middle arm forms a pole posed at right angles to said E-shaped portion`,of a sleeve of magnetic material on said' pole piece, a second pole piece securedto said piece, parts of said laminations being dis` i' parts of said laminations and disposed around said sleeveto provide an annular magnetic yfield between the first-mentioned pole piece and said secondpole piece, a diaphragm7 andmeans reactingwith said field Vfor actuating'said diaphragm.

13. In a device of the kind described, the

combination with a magnet member formed of laminations and comprisingan E-shaped portion of which the Vmiddle arm forms a pole piece, parts Vof said laminations being parts of said f'laminations and disposed V- around said sleeve to provide an annularr magnetic field betweenv -tli first-mentioned` pole piece and said second pole piece, adiaphragm and aieXible member carried by said A parts of-said laminations for supporting the diaphragm, and means reacting withy said` field-for actuating said diaphragm.

i4. A device of the kind (described Com- Vprising a laminated magnet member having a laminated pole piece,` a second poley piece surrounding the irst-mentioned pole piece yto provide 'an annular magnetic field between said pole pieces, a sleeve of non-magnetic metal disposed around saidlaminated" pole j piece, Va winding around said sleeve, a diaphragm, and means reacting with said field for actuating said diaphragm.

In testimony whereof, we have hereunto set our hands this l5th day of June, 1929.

H. KARL Bouvinn FREELAND YwnLLs.

said pole piece, a second pole piece surround- Ving the irst-mentionedpole piece to provide a magnetic field, a diaphragm, and means reacting with said eld for actuating said diaphragm.

11. kIn a device of the kind described, the combination with a magnet member formed of laminationsand havingl ya substantiallyv E- shaped portion of which the middle arm forms a pole piece, parts of said laminations 

